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I @il gisten @anni @fitta Letters Patent No. 78,962, dated June 16, 1868.

IMPROVEMENT IN DOORfLOGKS.

tlg .rlgrtlile referrer in im this eiteni @that mit mating patiti it anni.

TO ALL WHOM`IT MAY GOVN'CERN 4 Be ,it 4known that I, RICHARD C. HARRINGTON, of Newark, in the county ,of Essex, and State of New Jersey, i

have invented a newand improved Door-Lock; andl do hereby declare that the following is a full, clear, and

exact description'thereof, which-will enable others skilled in the art to make and use the same, reference beingl hadto the accompanying drawings, forming part of thisspeciiication, in which-i Figure 1 represents an outside View of my improved lock, the outside plate having been removed.

Figure 2 is adetail outside view ofthe same, the parts being ina position different from that shown in ig.'1. Figure 3 isa vertical cross-section of the same, the plane of section being indicated by the line a: 2:, fig. 1.

Similar letters of reference indicate like parts. p I This invention relates to a new door'lock, which is so arranged as to be altogether burglar-proof. It is `provided with two keyholes ,'one on the inside and one on the outside, lbut not opposite to each other, and it is so constructed that it can at all Atimes be locked and unlocked from the inside, also unlocked from the outside 'when ithas been locked fromith'e outside,| but itcannot, under any circumstances, beopened from the outside if it has been locked from the inside; and as provision is also made that'the lock cannot be picked from the outside, it will be fully bnrgvlar-proof when locked from the inside.

A represents the case'of the lock, in which a is the inside plate and L the outsideplate. The case is longer than itis high, and is divided by a vertical partition, c, into two compartments B and O. To the compartment B, which is nearest to the outer edge of the lock, leads akey-hole, d, from the inside of the door, while from the outside a key-hole is made into the plate b, communicating with the compartment C. D is the bolt, which reaches through the partition c into'the compartment C, and which is provided with two recesses for ther key, one over each one ofVA thekey-holes.

E is4 the` tumbler, which is pivoted in thecompartment C, and which reaches through a slot in the partition,

c into the compartment Bf It ha's'a lug or pin, e, which holds and prevents the bolt from moving in or out,

when'the sameis locked or unlocked, as its ts over a similar lug 'or pin, lz', which is secured to the bolt. From the outside the boltv vis simply locked or unlocked by inserting the key-and letting it raise the tumbler, so that it can push the'bolt either in or out as the case may be.4 A curtain, F, may also bearranged in the compartment C, or'any other arrangements made therein, by which the locks are now generally protected, or with which they may beadvantageously provided. ,A v

i The key-hole C, in the inside plate of the lookfcase, is surrounded bya curvilinear curtain or slotted cam, G, which is pivoted atits lower end, and which is shaped as is clearly shownin igs. 1 and 2. Y

'H is a sliding plate', which is guided between two guides,f f, and which is pressed by the outer end of a spring, h, uponfthe upper end df the cam G. A lng, g, upon this plate, its through a. slot in the bolt D, that slot having a small downward extension, as shown.v VThe outer end of the tumbler E rests upon the sliding late H. p The operation is simple, and as follows: When the bolt is to be unlocked from the inside, the keymoves the cam G towards the partition ci, raises the plate H, and with it the tumbler E, so as to release the pins, e 2', and then moves the bolt back. The cam Gr and plate H, as well as the tumbler E, will then be in the same position whiehis shown in iig. 1, although the bolt will be drawn in.

When, then, the holt is locked-from the outside, the key will simply raise the tumbler and push out the bolt.

.Then all the parts are in the position shown in fig. `1. But if the bolt i'sto be locked from the inside, then the key'moves the cam towards'the face of the lock, thereby the plate H is raised onI the rounded upper end of the cam, the plate H raising also the tumbler, and then .the bolt is pushed ont. v

.But as soon as that is done, the plate H is, by the spring k, moved down into a depression of the cam, so that its llug, g, falls into the small downward extension'of the slot in the bolt, said downward extension being completely, or nearly so, lled b'y the said lug, asshown in iig. 2. It will now be understood that the holt cannot be moved unless itis releasedfrom the lug g, which-cannotbe done from the outside, ,thnt is, from 4the compartment C, as for that purpose thel plate H must be raised, which canonly'be done by rrtnns of the camG.

vThe partition' c preventsthat the plate Gr can be raised by any article tliat may be inserted through the outer key-hole.

The-improvements herein described canbe applied to locks of dilferentkinds ofoonstruction. What 'I claim as new, and desire to secure by Letters Patent, i9.-

Tlie egim G, sliding plate H, and lug g, in combination with the bolt D, tumbler E, and the partition c., allv madeand operating substantially as and for the purpose herein shown and described.

' RIOHD C. HARRINGTON.

Witnesses: PETER A. SsooA G. SANDFORD. 

